On The Distribution of Linear Biases: Three Instructive Examples
Author
Summary, in English
Despite the fact that we evidently have very good block ciphers at hand today, some fundamental questions on their security are still unsolved. One such fundamental problem is to precisely assess the security of a given block cipher with respect to linear cryptanalysis. In by far most of the cases we have to make (clearly wrong) assumptions, e.g., assume independent round-keys. Besides being unsatisfactory from a scientific perspective, the lack of fundamental understanding might have an impact on the performance of the ciphers we use. As we do not understand the security sufficiently enough, we often tend to embed a security margin -- from an efficiency perspective nothing else than wasted performance. The aim of this paper is to stimulate research on these foundations of block ciphers. We do this by presenting three examples of ciphers that behave differently to what is normally assumed. Thus, on the one hand these examples serve as counter examples to common beliefs and on the other hand serve as a guideline for future work.
Publishing year
2012
Language
English
Pages
50-67
Publication/Series
Lecture Notes in Computer Science
Volume
7417
Document type
Conference paper
Publisher
Springer
Topic
- Electrical Engineering, Electronic Engineering, Information Engineering
Keywords
- Invariant subspaces
- Block ciphers
- Linear hull
- Linear cryptanalysis
- Security margin
Conference name
CRYPTO
Conference date
2012-08-19 - 2012-08-23
Status
Published
Project
- EIT_HSWC:Coding Coding, modulation, security and their implementation
Research group
- Crypto and Security
ISBN/ISSN/Other
- ISSN: 0302-9743
- ISSN: 1611-3349
- ISBN: 978-3-642-32009-5
- ISBN: 978-3-642-32008-8